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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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AD652KP Datasheet(PDF) 21 Page - Analog Devices |
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AD652KP Datasheet(HTML) 21 Page - Analog Devices |
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21 / 28 page  AD652 Rev. C | Page 21 of 28 –VS φ2 +VS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 0.02 µF VOLTS OUT V2 +5V 4k Ω MPX INPUT –VS φ3 +VS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 0.02 µF VOLTS OUT V3 –VS φ4 +VS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 0.02 µF VOLTS OUT V4 1N4148 φ2, φ3, φ4 ARE PINS 15, 7, 6 OF TIM9904A FROM DEMUX FIGURE 30 Figure 31. Demultiplexer Frequency-to-Voltage Conversion +5V TRANSFORMER PICO 31080 24 TURNS T50- MICROMETALS CK '74 Q D CK '74 Q D Q 500 Ω +15V 1 2 3 4 5 6 7 –15V 8 16 15 14 13 12 11 10 9 ONE SHOT AND "D" FLOP QCK D Q 1mA 20k Ω AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 5V REFERENCE 0.02 µF 1nF LO HI VIN 3k Ω 1k Ω 1nF 6N137 OPTO- ISOLATOR 5 4 6 3 7 2 8 1 ISOLATION BARRIER FREQUENCY OUTPUT 2N6659 2N6659 MYLAR 0.01 µF +5V 10 µH 100 Ω 100 Ω 12 3 1.65k Ω 1.65k Ω AD654 1 8 2 7 3 6 4 5 DRIVER OSC 200pF 1.2k Ω 6.8k Ω 10k Ω 1.5k Ω V AD589 1.2V +5V 1N4148 4 5 6 7 +15V REG 7815 –15V REG 7915 47 µF 47 µF 47 µF 47 µF +15V –15V 10k Ω Figure 32. Isolated Synchronous VFC Analog Signal Reconstruction If it is desired to reconstruct the analog voltages from the multiplex signal, three more AD652 SVFC devices are used as frequency-to-voltage converters, as shown in Figure 31. The comparator inputs of all the devices are strapped together, the “+” inputs are held at a 1.2 V TTL threshold, and the “−” inputs are driven by the multiplex input. The three clock inputs are driven by the ϕ outputs of the clock chip. Remember that data at the comparator input of the SVFC is loaded on the falling edge of the clock signal and shifted out on the next rising edge. Note that the frequency signals for each data channel are available at the frequency output pin of each FVC. |
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